Chemistry Practicals Class 12 Viva Questions with Answers
Question.1. Why is a Bunsen burner provided with air holes?
Answer. To regulate the supply of air.
Question.2. What type of flame would you use for general heating purpose?
Answer. A non-luminous oxidising flame as it gives maximum heat due to complete combustion of hydrocarbons.
Question. 3. What is the use of a fume cup-board?
Answer. It is used to perform those experiments which involve the production of poisonous gases or vapours.
Question.4. What is the use of wash bottle?
Answer. It is used for getting a thin stream of water required for washing or transferring a precipitate.
Question. 5. What first aid is necessary when an acid gets into an eye while working in the laboratory?
Answer. The injured eye should be washed freely with water and then 1% solution of sodium bicarbonate.